602STRUCTURAL PLATE PIPE

602-1.01 DESCRIPTION . Construct galvanized corrugated steel plate or aluminum alloy plate

pipes, at the locations shown on the Plans.

602-2.01 MATERIALS. Use materials that conform to the following:

Pipe Subsection 707- 2.04 Bedding and backfill Subsection 204- 2.01

602-3.01 CON STRUCTION REQUIREMENTS. Lay field -assembled plate pipes in conformance

to the lines and grades approved by the Engineer. Excavation, grading, and backfill must conform to Subsection 204- 3.01. Repair damage to the zinc coating according to AASHTO M 36. Pre-shape bedding material to fit the lower portion of the pipe. Pre- shape to a depth of one- tenth of the pipe height and wide enough to permit compaction under the haunches. Strutting is not permitted. When elongated pipes are specified, form the plate sections at the factory so that the pipe’s vertical dimension is increased by 5 percent of the specified diameter. Provide the Engineer with a copy of the manufacturer's recommendations and instructions and comply with them.

602-4.01 METHOD OF M EASUREMENT. See Section 109, measured along the invert of each

pipe of the type and size specified.

602-5.01 BASIS OF PA YMENT. Structure excavation, bedding, and backfill for structural plate

pipe is paid for under Section 204. Payment will be made under: PAY ITEM Item Number Item Description Unit 602.0001.____ Structural Plate Pipe ___Diameter, ___Gauge LF 602.0002.____ Structural Plate Pipe -Arch ___Span, ___Rise, ___Gauge LF 602.0003.____ Structural Plate Arch, ___Span, ___Rise, ___Gauge LF 286 ALASKA 2020 SECTION 603 CULVERTS AND STORM DRAINS

603-1.01 DESCRIPTION . Construct or reconstruct culverts and storm drains (pipe), to the lines

and grades shown on the Plans.

603-2.01 MATERIALS. Use materials that conform to the following:

Bedding and Backfill Subsection 204- 2.01 Joint Mortar Subsection 705- 2.04 Flexible Watertight Gaskets Subsection 705- 2.05 Non- Reinforced Concrete Pipe Subsection 706- 2.01 Reinforced Concrete Pipe Subsection 706- 2.02 Corrugated Polyethylene Pipe (Unperforated) Subsection 706- 2.07 Corrugated Steel Pipe and Pipe Arches Subsection 707- 2.01 Bituminous Coated Corrugated Steel Pipe and Pipe Arches Subsection 707- 2.02 Corrugated Aluminum Pipe Subsection 707- 2.03 When Item 603.0017.____ , Pipe, is listed in the bid schedule, furnish either Corrugated Steel Pipe (CSP), Corrugated Aluminum Pipe, Reinforced Concrete Pipe, or Corrugated Polyethylene Pipe. End Sections for Metal Pipe must be of the same material as the pipe. When extending in- place metal culverts and/or reattaching end sections with dissimilar metal, provide an electrical insulating material to separate the dissimilar materials. The insulating material must be at least 1/16 inch thick and be approved by the Engineer. Select pipe for each installation which meets or exceeds the requirements shown on t he Plans for height of cover. CONSTRUCTION REQUIREMENTS

603-3.01 GENERAL. Excavation, bedding, and backfill must conform to the requirements of

Subsections 204- 2.01 and 204- 3.01, and the details on the Plans.

603-3.02 LAYING PIP E. Begin the pipe laying at the downstream end of the pipe. Keep the

lower segment of the pipe in contact with the shaped bedding throughout its full length. Place bell or groove ends of rigid pipe and outside circumferential laps of flexible pipe facing upstream. Lay paved or parti ally lined pipe so that the longitudinal center line of the paved segment coincides with the flow line. Install elliptical conduit and circular conduit reinforced with other than a full circular cage or cages so the orientation of a vertical plane through the longitudinal axis of the conduit does not vary more than 5 degrees from the design orientation. Repair damaged metallic coating on metal pipe according to AASHTO M 36.

603-3.03 Joining Pip E.